"The new ZEISS Lens Gear Rings in the four sizes turn camera lenses into movie lenses in a flash. The ZEISS Otus, ZEISS Milvus and ZEISS Loxia lenses are now also compatible with follow focus systems. How? The new ZEISS Lens Gear Rings in the four sizes mini, small, medium and large turn camera lenses into movie lenses in a flash. Quick mounting f no tools needed Made of lightweight aluminum Hardened surface coating Features a 0.8 pitched gear Follow focus runs smoother than ever before No more screwdrivers, worn-out belts or protruding straps ZEISS Lens Gears boast impressive versatility and no-fuss mounting The ZEISS Lens Gear Rings are made of premium aluminum with a hardened surface coating, are slid onto the relevant lens and attached to the focus ring of the lens simply by turning the two counteracting rings. This means the ZEISS Lens Gears can be attached in a flash f and you don't even need any tools to do so. Holding one ring firmly, turn the other clockwise to attach the lens and counter-clockwise to remove it. Four different sizes for all ZEISS Otus, ZEISS Milvus and ZEISS Loxia lenses (This model is Medium size) The ZEISS Lens Gears are available in four different sizes: mini, small, medium and large. ""They fit on the different lenses of various diameters precisely and securely,"" continues Casenave. ""The use of a follow focus system enables optimal focusing and the ZEISS camera l"